TLC5955 Texas instruments

TLC5955

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TLC5955

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Описание

The TLC5955 is a 48-channel, constant-current sink driver. Each channel has an individually-adjustable, pulse width modulation (PWM), grayscale (GS) brightness control with 65,536 steps and 128 steps of constant-current dot correction (DC). DC adjusts brightness deviation between channels. All channels have a 128-step global brightness control (BC). BC adjusts brightness deviation between the R, G, B color group. The eight-step maximum current control (MC) selects the maximum output current range for all channels of each color group. GS, DC, BC, and MC data are accessible with a serial interface port. The TLC5955 has two error flags: LED open detection (LOD) and LED short detection (LSD). The error detection results can be read with a serial interface port.

48 Constant-Current Sink Output Channels
Sink Current Capability with Maximum MC, DC, and BC Data:
- 23.9 mA (V_CC ≤ 3.6 V, MC = 5)
- 31.9 mA (V_CC > 3.6 V, MC = 7)
Grayscale (GS) Control:
- 16-Bit (65,536 Steps) with Enhanced Spectrum or Conventional PWM
Maximum Current (MC) Control:
- 3 Bits (8 Steps) with a 3-mA to 30-mA Range
- 3 MC Sets for Each Color Group
Dot Correction (DC) Control:
- 7 Bits (128 Steps) with a 26.2% to 100% Range
Global Brightness Control (BC):
- 7 Bits (128 Steps) with a 10% to 100% Range
- 3 BC Sets for Each Color Group
LED Power-Supply Voltage: Up to 10 V
VCC: 3.0 V to 5.5 V
Constant-Current Accuracy:
- Channel-to-Channel: ±2% (typ), ±5% (max)
- Device-to-Device: ±2% (typ), ±4% (max)
Data Transfer Rate: 25 MHz
Grayscale Control Clock: 33 MHz
Auto Display Repeat
Display Timing Reset
Auto Data Refresh (GS and DC Only)
LED Open Detection (LOD)
LED Short Detection (LSD)
UVLO Sets Default Data
Delay Switching to Prevent Inrush Current
Operating Temperature: –40°C to +85°C

Number of channels	48
LED current per channel (mA)	31.9
LED configuration	Parallel, Series
Topology	Linear
Vin (min) (V)	3
Vin (max) (V)	5.5
Iout (max) (A)	1.531
Features	Analog/PWM mixed dimming, Constant current, Current control, PWM control, Serial interface
Iq (typ) (mA)	15
Operating temperature range (°C)	-40 to 85
Rating	Catalog